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import {
type IActivity,
type IEither,
IMetric,
type ITraceable,
JsonResponse,
LogLevel,
type Mapper,
Metric,
type PenguenoRequest,
type ServerTrace,
TraceUtil,
} from '@emprespresso/pengueno';
export enum HealthCheckInput {
CHECK,
}
export enum HealthCheckOutput {
YAASSSLAYQUEEN,
}
export interface IHealthCheckActivity {
checkHealth: IActivity;
}
const healthCheckMetric = Metric.fromName('Health').asResult();
export interface HealthChecker
extends Mapper<ITraceable<HealthCheckInput, ServerTrace>, Promise<IEither<Error, HealthCheckOutput>>> {}
export class HealthCheckActivityImpl implements IHealthCheckActivity {
constructor(private readonly check: HealthChecker) {}
public checkHealth(req: ITraceable<PenguenoRequest, ServerTrace>) {
return req
.flatMap(TraceUtil.withFunctionTrace(this.checkHealth))
.flatMap(TraceUtil.withMetricTrace(healthCheckMetric))
.flatMap((r) => r.move(HealthCheckInput.CHECK).map((input) => this.check(input)))
.peek(TraceUtil.promiseify(TraceUtil.traceResultingEither(healthCheckMetric)))
.map(
TraceUtil.promiseify((h) => {
const { status, message } = h.get().fold(
() => ({ status: 500, message: 'err' }),
() => ({ status: 200, message: 'ok' }),
);
return new JsonResponse(req, message, { status });
}),
)
.get();
}
}
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